/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2001, 2002,2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.impl.dv.xs;

import com.sun.org.apache.xerces.internal.impl.dv.InvalidDatatypeValueException;
import com.sun.org.apache.xerces.internal.impl.dv.ValidationContext;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import com.sun.org.apache.xerces.internal.impl.dv.util.ByteListImpl;

/**
 * Represent the schema type "base64Binary"
 *
 * @author Neeraj Bajaj, Sun Microsystems, inc.
 * @author Sandy Gao, IBM
 * @version $Id: Base64BinaryDV.java,v 1.7 2010-11-01 04:39:46 joehw Exp $
 * @xerces.internal
 */
public class Base64BinaryDV extends TypeValidator {

  public short getAllowedFacets() {
    return (XSSimpleTypeDecl.FACET_LENGTH | XSSimpleTypeDecl.FACET_MINLENGTH
        | XSSimpleTypeDecl.FACET_MAXLENGTH | XSSimpleTypeDecl.FACET_PATTERN
        | XSSimpleTypeDecl.FACET_ENUMERATION | XSSimpleTypeDecl.FACET_WHITESPACE);
  }

  public Object getActualValue(String content, ValidationContext context)
      throws InvalidDatatypeValueException {
    byte[] decoded = Base64.decode(content);
    if (decoded == null) {
      throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1",
          new Object[]{content, "base64Binary"});
    }

    return new XBase64(decoded);
  }

  // length of a binary type is the number of bytes
  public int getDataLength(Object value) {
    return ((XBase64) value).getLength();
  }

  /**
   * represent base64 data
   */
  private static final class XBase64 extends ByteListImpl {

    public XBase64(byte[] data) {
      super(data);
    }

    public synchronized String toString() {
      if (canonical == null) {
        canonical = Base64.encode(data);
      }
      return canonical;
    }

    public boolean equals(Object obj) {
      if (!(obj instanceof XBase64)) {
        return false;
      }
      byte[] odata = ((XBase64) obj).data;
      int len = data.length;
      if (len != odata.length) {
        return false;
      }
      for (int i = 0; i < len; i++) {
        if (data[i] != odata[i]) {
          return false;
        }
      }
      return true;
    }

    public int hashCode() {
      int hash = 0;
      for (int i = 0; i < data.length; ++i) {
        hash = hash * 37 + (((int) data[i]) & 0xff);
      }
      return hash;
    }
  }
} // class Base64BinaryDV
